Window lock



FIG. 1 is a perspective view of a window lock showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a side view thereof; and,

FIG. 6 is an opposite side view thereof. 

The ornamental design for a window lock, as shown and described. 